Roller hill



I Re. 15,620

F. B. MARcY ROLLER MI 2 Sheds-Sheet 1 02' Original Filed Jan, 25 1919 my WE m ATTORNEY;

June 5, 1923.

v FLE. MA cY ROLLER KILL 0r1g1na1' Filpd Jan. 25 1919 2 sheetsvsheet v v iv 194229 A M. l

I I I m 5 K W Reisaued June 5, 1923.

FRANK E. HARDY, 01' LOS-ANGEIJES, CALIFORNIA.

. nouns, urn.

Original application filed January 25, 1919, Serial No. 273,087. Renewed October 18, 1920, Serial No. 418,778. Original No. 1,381,601, dated December 7, 1920. Application for reissue filed November 16,

1822. Serial I0. 801,240.

T6 allwhomitmay concern: c

' Be it known that I, FRANK E. Manor, a

citizen ofthe United States, residing at Los Angeles, in the county of Los Angeles and 5 State of California, have invented certain new and useful Improvements in Roller Mills, of which the following is a specification, reference beinghad to the accompanying drawings, forming a part hereof.

1 he present invention isdirected to 1mprovements in roller (or rod) mills which, as well understood in the art, belong to that class of reducing or disintegrating a paratus wherein the material 1s reduce by 5 means of freely moving reducing bodies in the form of rods or rollers extended longitudinally substantially the length of the reducing compartment of the mill, the latter being in the form of a suitable tumbling barrel, drum, or equivalent tubular container or treatment vessel rotated about a fixed axis, the opposite ends of the barrel being provided respectively with intake or feed, and discharge openings for the materlal.

26 The present improvement is concerned with that type of mill in which the discharge end is left open and unobstructed (111 contrad atinction to the trunnion overflow type of mill) for the passage of the material there- 30 through and for the purpose of affording ac cess to the interior of the mill at all times, and permitting inspection of its contents at any stage of the reducing operation. A mill of the open endtype here referred to is preferably provided with a flange or diaphragm at the point of discharge, said flange serving to build up or raise the pulp line in the mill and thereby permitting the charge of material to be subjected to the reducing action ofso the rods (or their equivalent) for a somewhat longer period of time than would be the case were the flange dispensed with and the pulp line allowed to drop. It is desirable in a mill of the character referred to, to

provide means for preventing the reducina' bodies from being projected out of the mill through the open discharge end, or through the available opening defined by the inner or overflow edge of the flange aforesaid; and in the present embodiment of my invention I resortito a suitable rod-intercepting doorm guard mounted on the barrel in such av way i that while it permits of the free and unintermainly by simplicity of construction, and

the variety of forms the same may assume without a departure from the basic principle of the invention. The advantages of the improvement will be clearly apparent from the .following detailed description in connection with the accompanying drawings in which Figure 1 represents a side elevaton of a mill with parts broken away showing one form of my invention applied. thereto; Fig. 2 is an end elevation looking toward the discharge end; Fig. 3 is a sectional side elevation of the discharge end of a mill showing another form of my'invention; Fig. 4 is an end View,v of Fig. 3; Fig. 5 is a vertical middle longitudinal section of a mill showing a further modification of my invention Fig. 6 is a similar view showing a further modification; Fig. 7 is a view similar to Fig. 5 showing another modification; Fig. 8

is an endview of Fig. 7; Fig. 9 is a view similar to Fig. 5 showing a modification In. which the discharge slot isformed in the flange at the open end of the mill; Fig. 10 is an end view of Fig. 9; Fig. 11 is a view SllIlllar to Fig. 9 showing a modification in which the discharge slot is formed in the door or rod-intercepting member; and Fig. 12 is an end view of Fig. 11.

Referring to the drawin and for the present to Figs. 1 and 2,

, represents a .(preferably) cylindrical container, drum,

tumbling barrel or equivalent tubular member, slightly pitched to the horizontal h, the reducing compartment C of the mill or barrel containing the usual complementof reducing bodies which in the present example are in the form of longitudinally extended, loose, reducing rods or rollers 1 free to tumble in the barrel as the latter rotates in the reducing operation of the mill, only a portion of -'the entire complement of rods being herein illustrated. a The wall liner2is provided with p I inclined lifters 3 which operate. to first lift the reducing rods and then release them in such a we as to cause the rods to tumble or precipitate away opening of (the mill, the rods being maintained permanently in the reducing oompartment C through the combined action of the pitch of the mill, the lifters 3, the flange 4 at the open discharge end of the mill which likewise serves to raise or build up the pulp line and the 'ard or rod-intercepting plate or door to w ich the present improvement is in the main directed. In the present example the mill is provided with a hollow feed or intake trunnion 5 equipped. with a conventional scoop feeder 6, which scoops up the pulp from a suitable launder '1 7, the material discharged from the mill being caught in a launder 8 as well understood in the art. p

In the present improvement the guard or rod-intercepting member is carried by the barrel D and assumes the form of adoor 9 preferably hinged to the barrel in front of the flange 4, the diameter of the door being smaller than the diameter of the discharge opening defined by the inner edge of the flange, whereby there is formed between the center of the guard and the peripheral wall W of the barrel D, in the present instance between the flange and' door an annular slot or passage-way 0 for the discharge'of the material from the mill. Since the hinge axis of the door is necessarily located at a point exterior to the periphery of the door, it follows that the continuity of the slot 0 will be interrupted at least at the point where the rib t of the door forming one of the elements or leaves of the hinge structure, spans the slot to connect with the hinge pin a. In the example before us the rib t is likewise extended in the opposite direction across the slot or gap 0, terminating in an outwardly bent finger-hold t at which point the door is secured to the flange 4 by a ca -screw 10 or in any other suitable mechanica manner. The slot 0 is thus interrupted by the rib t at two oints; but this interruption in no wise intereres with the free discharge of the ulp from the mill. Preferably, the perip cry of the door 9 is made beveled or conical, the cone flaring outwardly, the inner edges of the flange 4 and its liner 4 being given a corresponding slope so that the slot 0 is virtually conical as clearly shown in Fig. 1. The relation of the adjacent edges of the flange and door to each other is such that while an opening is formed through which the material may discharge, the rods will at the same time be prevented from escape, because of their impossibility to assume such an inclined position as would be necessary for themto pass through said opening. In

from the discharge,

the particular example shown, the inner edge 0-0: of the flange falls abreast of and overlaps the outer edge 03 of the door. The pulp which builds, up to the dotted line indicated in Fig. 1 flows over the sloping edges of the flange 4 and liner 4 through the slot 0 into the launder 8 as indicated by the arrows. As stated above, the fimction of the door or guard 9 is to intercept any rod tending to precipitate out of the mill duringthe re ucing operation; but the door may be swung open at any stage of the reducing operation to allow forthe inspection of the mill contents, to make necessary repairs, and the like. The diameter of the door will necessarily depend on the width of the pulp upbuilding flange 4; and where such a flange is dwarfed or entirely absent (as may :be the case in-mills sufiiciently pitched to dispense with the flange) the door is correspondingly enlarged, suflicient space being left however between the periphery of the door and the walls of the reducing compartment C to form an annular (or equivalent) slot or passa eway for the discharge of the material. 5r, the door may be made large enough to entirely close the barrel opening and an interrupted annular (or equivalent) slot formed The mill or barrel is partment C, but since in their tumblin movements they are constantly being away from irected the discharge opening by the combined action of the pitch of the mill, and the inclined lifters, it follows that the rods will remain normally out of contact with the door or guard 9, but any rod which happens to strike the door 9 will of course necessarily be intercepted and prevented from falling out of the mill, it being noted that the inner surface of the guard is free of any obstacles to the tumbling movement of said rods. The impact of the rods against the door is however not frequent as the rods are in the main kept in the mill by the. pitch of the mill,.b the deflecting action of the lifters 3, and y the flange 4. The pulp enters the reducing compartment C through the hollow feed trunnion 5 and the finished product discharges 'as previously indicated, through the,open disc a-rge end of the mill.

The invention is obviousl variety of modifications. hus, in Figs. 3 and 4, is shown a mill or drum D with a pulp up-building flange 20, formed with an outwardly flaring overflowlip 20 ,discharginginto the launder 21, the pulp line susceptible of a.

provided 'with a lug or arm 22 0 posite its hinge axis which is secured to the 'p by means of a ca -screw 23.

n Fig. 5 is shown a barrel or mill T pro vided at the discharge end with a frustoconical flange and a door 31 is preferably hinged thereto and is normally held fastened by a cap-screw d, an annular slot 11 between the door periphery and inner edge of the i the flange being formed for the dischar e of the material. The flange 30 is form with a thickened portion 32 to afiord support for the screw d.

In Fig. 6 is shown a barrel T the discharge end of which is provided with a combined plane and frusto-conical flange 33 and a door 34 is preferably hinged thereto, and is normally held fastened by a cap-screw d, an annular discharge slot 11 being formed between eriphery of the door and inner edge of the ange.

In Figs. 7 and 8 is shown a barrel, or mill T provided at its discharge end with a plane flange 35, within the confines of which is nor- -mally disposed a door 36, said door in this instance being readily detachable from the barrel to permit access to the interior of the barrel and is held in place while in service position, by the cap-screws d passed through the opposite terminals of the central ribs t" formed on the door.

flow of the pulp'out of the barrel.

In all the forms above referred to, the discharge slot 0 or its equivalent is formed around the door 9 or its equivalent, that is to say between the periphery of the door and the Walls of the opening defined by the flange 4 or its equivalent (or the walls of the reducing compartment where the flange is absent). We may however, as examples of extreme modifications, locate the discharge slot either in the flange or in the door, in each of which cases the slot would still bebetween the walls of the reducing com artment and the center of the door as in t e preceding forms. Thus in Figs. 9 and 10 is shown a barrel T the open end of which is provided with a flange formed with an annular interrupted discharge slot u at such a point as to raise the pulp line a: the desired degree, a hinged door 38 in this case closing the opening of the flange and being normally held locked by the capscrew d. On the other hand, in Figs. 11 and 12 is shown a barrel T provided with a flange 39 at its open end, the opening defined by the flange being normally closedby the The annular slot .9. between the door and flange allows for the hinged door 40 in which at the proper pulp line is formed an annular interrupted dis charge slot, '00, the door when closed being fastened by a cap-screw d as shown. There are other modifications that are possible, but which need not be herein illustrated because readily suggesting themselves to the skilled mechanic. In all the forms described the door or rod-intercepting member or plate is disposed across the rotation axis of the mill or barrel, said axis passing preferably through the center of the door; In all the forms described the discharge slot (0, 0', i, i, s, u, 11),) conforms to the position desired for the pulp line, which, of course, may be raised or lowered according to circumstances, and according to conditions to be met with in practice. for the pulp-line is reached when the flange 4 or its equivalent disappears. The present invention of course is not to be restricted in its application to mills with a pulp-line of the particular height indicated herein, but is to be understood as applicable to mill having any range of pulp-line positions from the lowest to the highest which may be tolerated in practice.

Due to the disposition of the discharge The lowest position opening for the vmaterial, as shown in the various forms of the invention above described, wherein the material is permitted to flow from the reducing compartment di-- tially the full length of said compartment,

so that the entire length of the compartment is available in the reducing action of the rods.

It will be observed that in the different embodiments of my invention as illustrated in the accompanying drawings, the passageway for the discharge of the material is circumferential and is disposed between the Wall of the tumbling barrel and center of the door and in such relation to the barrel that the discharge of the material from the barrel will be wholly within the limits of said wall. In some instances this passageway is between the inner edge of an inwardly extending flange on the barrel and the outer edge of the door; in other instances the passage-way is through the flange; and in still other instances the passageway is through the door. Further it will be observed that the door while being attached to the barrel so as to rotate therewith, is capable of movement relatively to the barrel so that access may be gained to theinterior of the barrel. It is not the intention that all of the claims be limited in respect to these enumerated characteristics, as certain of the claims are broader and do not depend for patentability on such characteristics, while others are more limited and include the same.

Features shown in the drawing but not alluded'to are either well understood in the art, or form the subject-matter of other pending applications filed by me.

Having described my invention, what I claim is: V

1. In a mill of the character described, a tumbling barrel having a feed end and a normally open discharge end, an inwardly projecting flange at the discharge end, the inner edge of the flange defining the available opening through' which the material may flow, freely moving reducing bodies in the barrel, and a door or plate secured to the barrel having a maximum dimension less than the diameter of the opening aforesaid and adapted to be moved across said opening to form with the boundaries thereof an annular passageway for the direct discharge of the material.

' 2. In a mill of the character described, a tumbling barrel having a feed end and a normally open discharge end, an inwardly projecting flange at the discharge end, a

door secured to the barrel and closing across the plane f disposition of the flange, a suitable passage-way being formed between the inner edge of the flange and the center of the door, for the direct discharge of the material.

3. In a mill of the character described, a tumbling barrel having an open discharge end surrounded by a flange operating to raise the pulp line, and provided with an outwardly flaring lip leading from the inner edge of the flange, and a door or movable plate cooperating with the lip and forming therewith an annular passage-way for the discharge of the material.

I 4. In a mill of the character described, a tumbling barrel having a feed-endand a discharge end, and provided with a reducing compartment adapted to contain freely movable reducing rods, and a rod intercepting guard secured to the barrel and disposed across thedischarge end and movable relatively to the same, the inner surface of said guard being free of any obstacles to the movement of said rods, a suitable slot being formed between the wall of the tumbling barrel and the center of the door and extending circumferentially of the barrel for the direct discharge of material.

5. In a mill of the character described, a tumbling barrel having a feed end and a discharge end and' provided with a reducing compartment adapted to contain freely movable reducing rods, and a rod-intercepting guard closing across the discharge end of the barrel and adapted to be moved at will to a position to permit access to said reducing compartment, the inner surface of said guard being free of any obstacles to the movement of said rods, a suitable passageway being formed between the wall of the tumbling barrel and the center of the guard, I 'and so formed and disposed as to efl'ect the center of the guard and so disposed and formed as to effect the direct discharge of material from the barrel wholly within the limits of said peripheral wall.

7. In a mill of the character described, a

rotatable barrel having a feed end and a discharge and and adapted to contain longitudinally extending, loose, freely movable, reducing rods, and arod-inte'rcepting guard atthe discharge end for preventing the accidental escape of the reducing rods from the barrel, said guard being spaced radially from the peripheral wall of the barrel to provide a discharge opening through the discharge end for effecting the direct discharge of material from the mill.

8. In a rod mill, a rotatable barrel having a feed end and .a discharge end and provided with a reducing compartment having a discharge opening at the discharge end which is open for effecting the discharge of material from the reducing compartment while the machine is in operation, longitudinally extending loose freely movable reducing bodies in said compartment removable through the discharge end of the barrel and a rod intercepting guard at the discharge end of the barrel adapted to prevent the accidental escape of the reducing bodies from the reducing compartment, said guard being freely removable to permit access to the interior of the reducing compartment without freeing the reducing bodies. a 9. In a mill of the character described, a

rotatable barrel having a feed end and a discharge end and provided witha reducing compartment having a discharge opening, the inner limits of one edge of said opening being abreast of the outer limits of the other edge of said opening.

. 10. In a mill of the character described, a rotatable barrel havinga feed end and a dis charge end and provided with a reducing compartment having a discharge opening with overlapping edges.

11. In a mill of the character described. a I

rotatable barrel having a feed end and a discharge end and provided with a reducing compartment having a discharge opening in the form of an inclined passageway having opposed substantially parallel inclined walls ential discharge opening with an outwardly formed to effect thedirect discharge of maflaring flange around the same formed to terial from the nfill. L effect the direct discharge of material from 12. In a mill of the character described, a the mill.

5 rotatable barrel having a feed end and a In testimony whereof, I have affixed my discharge end and provided with a. reducing signature hereto.

- compartment having an annular circumfer- FRANK E. MARCY. 

